I need some help people. Done a search but only came out looking even more confused......wouldn't know my ground sheet from a Hydro Head

. Looking at three man tents as the two man tent(Billys) I used last could have done with being a wee bit bigger.
Most seems to be 1500HH but the ones in the list below appear to be 2000 HH......that make a lot of difference?
I'm looking to get something that is more than 'throw away' even if it doesn't get used again hehe. I believe a double skinned tent is also preferable ?
Anyhoos, I'd be much obliged to have recommendations from the list below.
http://www.winfieldsmegastore.com/in...N&level3=VANGO
http://www.winfieldsmegastore.com/in...N&level3=VANGO
http://www.gooutdoors.co.uk/tents/5023518601106
http://www.blacks.co.uk/Tents-and-Ca...ct/094484.aspx
Budget is £70 but the cheaper, the better eh.....
Cheers
Ben